package com.sari.common.utils;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.UnsupportedEncodingException;
/**
 * 取得给定汉字串的首字母串,即声母串
 * <p>Title: ChineseCharToEn</p>
 * <p>@author javer QQ:84831612</p>
 * @version 1.0
 * @date 2004-02-19
 * 注：只支持GB2312字符集中的汉字
 */
public final class ChineseCharToEn{

    private static Logger logger = LoggerFactory.getLogger(ChineseCharToEn.class);

    private final static int[] li_SecPosValue =
            {
                    1601, 1637, 1833, 2078, 2274, 2302, 2433, 2594, 2787, 3106, 3212, 3472,
                    3635, 3722, 3730, 3858, 4027, 4086, 4390, 4558, 4684, 4925, 5249, 5590
            };
    private final static String[] lc_FirstLetter =
            {
                    "a", "b", "c", "d", "e", "f", "g", "h", "j", "k", "l", "m", "n", "o", "p",
                    "q", "r", "s", "t", "w", "x", "y", "z"
            };

    /**
     * 取得给定汉字串的首字母串,即声母串
     * @param str 给定汉字串
     * @return 声母串
     */
    public static String getAllFirstLetter(String str)
    {
        if (str == null || str.trim().length() == 0)
        {
            return "";
        }

        String _str = "";
        for (int i = 0; i < str.length(); i++)
        {
            _str = _str + getFirstLetter(str.substring(i, i + 1));
        }

        return _str;
    }

    /**
     * 取得给定汉字的首字母,即声母
     * @param chinese 给定的汉字
     * @return 给定汉字的声母
     */
    public static String getFirstLetter(String chinese)
    {
        if (chinese == null || chinese.trim().length() == 0)
        {
            return "";
        }
        chinese = conversionStr(chinese, "GB2312", "ISO8859-1");

        if (chinese.length() > 1) //判断是不是汉字
        {
            int li_SectorCode = (int) chinese.charAt(0); //汉字区码
            int li_PositionCode = (int) chinese.charAt(1); //汉字位码
            li_SectorCode = li_SectorCode - 160;
            li_PositionCode = li_PositionCode - 160;
            int li_SecPosCode = li_SectorCode * 100 + li_PositionCode; //汉字区位码
            if (li_SecPosCode > 1600 && li_SecPosCode < 5590)
            {
                for (int i = 0; i < 23; i++)
                {
                    if (li_SecPosCode >= li_SecPosValue[i] &&
                            li_SecPosCode < li_SecPosValue[i + 1])
                    {
                        chinese = lc_FirstLetter[i];
                        break;
                    }
                }
            }else{ //非汉字字符,如图形符号或ASCII码
                chinese = conversionStr(chinese, "ISO8859-1", "GB2312");
                chinese = chinese.substring(0,1);
            }
        }

        return chinese.toUpperCase();
    }

    /**
     * 字符串编码转换
     * @param str 要转换编码的字符串
     * @param charsetName 原来的编码
     * @param toCharsetName 转换后的编码
     * @return 经过编码转换后的字符串
     */
    private static String conversionStr(String str, String charsetName,String toCharsetName)
    {
        try
        {
            str = new String(str.getBytes(charsetName), toCharsetName);
        }
        catch (UnsupportedEncodingException ex){
            logger.warn("字符串编码转换异常：" +Exceptions.getStackTraceAsString(ex));
        }

        return str;
    }
    public static void main(String[] args)
    {
//        String name = "怡";
//        System.out.println("\"怡\"的首个拼音字母是：" + ChineseCharToEn.getFirstLetter(name.substring(name.indexOf("（")+1)));

    }
}
